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stefan_iro
Joined: 18 Jan 2008
Posts: 12
Location: Germany
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 Posted: Fri Jan 18, 2008 7:41 pm Post subject: Doctor PC jr NTSC modification |
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Hello!
I luckily own one of these rare devices called Doctor PC jr. Unfortunately it outputs a PAL signal (black borders & 20% less speed).
Therefore I have decided to perform a modification for NTSC video out!
A friend of mine has already modified a PAL Tristar to NTSC video out.
He just replaced the 26.6 Mhz crystal with a 21 Mhz crystal. Additionally a broken bridge on the PCB has been reconnected.
Similarly there is a broken connection on the PCB of my PAL Doctor PC jr near the glue logic chip.
Can anyone confirm that this connection is NOT broken on the PCB of a NTSC Doctor PC jr?
I just don´t want to take the risk of damaging my beloved Doctor PC jr!
Stefan |
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madman
Joined: 07 Jul 2006
Posts: 598
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| Posted: Sat Jan 19, 2008 5:29 pm Post subject: |
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| It doesn't make sense that a trace would be broken for one video signal and in tact for another. I'd probably repair it. |
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kyuusaku
Joined: 26 Jul 2003
Posts: 941
Location: .ma.us
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| Posted: Sun Jan 20, 2008 5:02 am Post subject: |
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| I think the video is hardwired inside the PPU. FC isn't like other consoles where RGB is passed to a NTSC/PAL encoder, the palette directly generates NTSC or PAL YIQ/YUV colors. |
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RGB_Gamer
Joined: 01 Oct 2007
Posts: 879
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| Posted: Sat Oct 08, 2011 2:05 am Post subject: Re: Doctor PC jr NTSC modification |
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| Has anyone ever found a fix to a PAL Dr NES PC Jr running NTSC games slow? |
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